Process of producing patterns on fabrics.



UNITED STATES PATENT OFFICE.

MORITZ FREIBERGER, OF BUDAPEST, AUSTRIA-HUNGARY.-

IP ROCESS OF P ZRODUCING PATTERNS ON FABRICS.

.No Drawing.

ments in Processes of Producing Patterns on Fabrics, of which the following is a specification. The present invention relates to a process of producing patterns on fabr cs.

The nitrogen 0Xy-acids are capable, owing to their oxidizing properties, of destroying certain dyestuffs, or altering their color. Thus forinstance indigo, even of dark tints, may be discharged by printing on it nitric acid. This method, however, 18 very rarely employed, because nitric acid renders it impossible to use metallic printing-blocks or "metallic printing-rollers and affects the firmness of the fiber, a fact which prohibits an extensive use of the saidproduct in the industry.

' Now I possible'to utilize the have found a process by which it is oxidizing action of the said compounds for discharging dyestuffs in a satisfactory manner without causing a corrosion of the fiber. This process consists in applying to the fabric the color ofwhich is to be discharged, printing colors which contain salts'of the nitrogen oxyaci'ds that cannot injure the metallicprinting rollers, and in effecting the discharging action by subsequently passing the fabrics through an acid'bath.. In this process it is important that the acid bat-h should be prepared at such a concentration and temperature that the duration of the passage of the fabric may be as short as possible whereby a complete (118- pilarging is obtained without affecting the er.

There may be used as discharging agents the salts of nitric acid, nitrous acid and jhyponitrous acid, as well as the salts of the analogous acids derived from the sai three acids. Strong acids, particularly sulfuric acid, and acid salts may be employedas the components of the acid bath, these l beratingthe acid fromthe salts of the above mentioned compounds, the liberated acid becoming the discharging agent. r trate my process, the fabric. may, be previously dyed with any desired color, then, in accordance with the pattern 'to"'be producechit is printed with a salt of the nitrogenoxy-acid-desired .to effect the discharge Specification of Letters Patent. vApplicatiim filed August 10, 1908. Serial No. 447,879.

Thus, to illus- 'at 80 through Patented Dcc.2.1i13.

.ing action. The fabric is then exposed to as short a passage through an acid as is suiticient for causing the reaction between the salt and the acid but does not permit of any harmful action of the acid on the fabric. The previously applied dye will then be discharged or has its color altered at the places printed with the salt, as at these places frcc mtrogen oxy-acid is produced. Thus for example, if it is desired to produce on a blue ground a pattern formed of white, yellow and red elements, a fabric dyed in indigo and eventually prepared in naphthol is printed with nitrateof zinc or with nitrite of soda to obtain white, with nitrate of lead -to obtain yellow,and with nitrate of soda to obtain red, with which latter salt, however, developing colors or red body colors or dyestuffs are mixed. The fabric is then steamed, exposed for a few seconds to a passage through sulfuric acid, at 40 Baum,

washed and then treated in chromate of potassium for developing the yellow color.

By combining the discharging color with dyestuffs, or with compounds from which colo'rs' can be produced, colored effects, socalled colored discharges may be obtained. Further: by adding a reducing agent, which frequently increases the discharging action in a surprising manner, a consecu tive reducing and oxidizing action may be produced on one and the same spot of the fiber. In this case the passage through the acid bath must, be preceded by steaming which causes the reducing-agcnt'to act. By this procedure quite new and peculiar effects can be obtained. I

The process may lowing examples:

Example I: The namely: 200 1 grams of nitrate of zinc, of starclrpaste, is printed on an indigoground, and after drying, the fabric is beillustratedbythe {01- following discharge,

passed for a few secendsthrough sulfuric acid 'of 40 B. at 5080 C. It is then washed, passed through caustic soda lye of 1 136. for half a minute at 40 C. and again washed and dried.

Example II: Like Example-I with'the ex ception that: 200 grams of sodium nitrite, and 200 grams of starch paste are used for discharging.

Example IIIi The=dischargfe described in Example II is passed for a few seconds a bath consisting of: 300

'red discharging thereby the blue.

liters of water, "100 kg. of sulfuric acid of 66 136., 100. kg. of hydrochloric acid of 20 136., 30 kg. of oxallcacid.

I EXampleIV: The fabric previously prepared inthe known manner with naphthol (20 grams of naphthol R., 40 ccn of caustic soda lye of 22 B. and 20 grams-of Para soap (sodium or ammonia-soap of ricinoleic acid) per liter of the preparing bat-l1) is printed" with the discharging colors, passed 'throughsulfuric acid of 40 B. for a'few seconds at.5080 C. and dried;

Disc/zarge-wkife.-200 grams of nitrate of zinc, 1 kg. of starch paste, 20 grains of concentrated formic acid.

Disc/ a'rge-i ellow. 200 grams of nitrate of lead. 1000 grams of tragaca-nth water. Discborge-red.Paranitranilin red-print ing-color containing 16 grains of parani.-

.ing to Example IV. Thus yellow incombmation with red and blue is obtanied, the

Example VI: Indigo-dyed cloth topped with cresotin-yellow G. or aurophenin' O. This green dyeing is printedwith the discharge-white described hereafter, treated in the Mather Platt, passed through sulfuric aci pic I and finished.

Discharge-white color.,100 grams of ni trate, 100 grams of hydrosulfite N. F. concentrated, 8 grams of anthraquinone paste,

mstc 1 lfxample VI :Accordingto Example VI, the indigo dyed cloth however being topped in the usual manner with paranitranilin red instead of with directdyestuifs.

I.'clain1 l. The process of figuring fabrics, which consistsin applying to the fabric, in either sequence, a dyestufi' giving the ground color, and a salt of an oxy-acid of nitrogen, said d according to Exam- I saltbcing printed 011, and reacting on said salt with an acid reagent under conditions to discharge the color, 7

a 2. The process of figuring fabrics, which consists inapplying to the fabric, in eithcn sequence, a dyestufi' giving the ground color. and a, salt of an oXy-a'cid. of nitrogen, said salt being printed on, and reacting on said salt withhot, strong, sulfuric acid under conditions to discharge the color.

.3. The process of producing patterns on fabrics, dyed with a ground color, which consists in printing on the fabric with a salt of a'mtrogen oxy-acld, then sub ecting the fabric thus treated to the action of a strong acid, and then Washing the fabric.

4. The process of producingT patterns on,

fabrics, dyed with a ground color, which consists in printing discharges comprising salts of the nitrogen oxy -acids, then subjectingthe fabric thus treated to the action of a strong acid to set free the nitrogen oxy-acid in the fiber, andthen washing the fabric.

5. The process of producing patterns by means of nitrogen oxy-acids on fabrics dyed with a ground color without atfecting the firmnessof the fiber, which consists in was ing the salts of the. nitrogen oXy-acids printed on the fabric to act by means of a short treatment with hot and strong acids.

0. The process of producing patterns by means of nitrogen oxy-acids on fabricsdyed with a ground color without affecting. the

'firmn'css' of the fiber, which consists in cansing the salts of the nitrogen oXy-acids printed on the fabric and to which, for the purpose of producing multi-colorcd effects, dyestuffs are added. to act by means of a' short treatment with hotiand'strong.acids. 7. The process of producing patterns on fabrics, dyed with aground color, wl-iich consists in printing on the fabric a mixture col'isisting of a salt of a nitrogen oxy acid and a substance capable of forming colors on the fiber; then subjecting the fabric thus treated to the action of a strong acid, and

washing thefabricj The prccess'of producing patterns-( n fabrics dyed with a ground colon-which consi'stsin printing onthe fabric a saltof nitric acid, then subjecting the fabric thus treated to the action of a strong acid, and-washing the fabric. I

In testimony. whereof I ailix my signature in presence of two witnesses.

' MORITZ FREIBERG'ICR. \Vitncsscs E. F. Kara-zines, M ri'lLu-a. 'lxon'rn. 

